diff --git a/packages/runtime-core/src/apiSetupHelpers.ts b/packages/runtime-core/src/apiSetupHelpers.ts
index 3815c7b143e..a55c3b3ff4e 100644
--- a/packages/runtime-core/src/apiSetupHelpers.ts
+++ b/packages/runtime-core/src/apiSetupHelpers.ts
@@ -301,7 +301,9 @@ type PropsWithDefaults<
   Defaults extends InferDefaults<T>,
   BKeys extends keyof T,
 > = Readonly<Omit<T, keyof Defaults>> & {
-  readonly [K in keyof Defaults]-?: K extends keyof T
+  readonly [K in keyof Defaults as K extends keyof T
+    ? K
+    : never]-?: K extends keyof T
     ? Defaults[K] extends undefined
       ? T[K]
       : NotUndefined<T[K]>